In order for a kitchen appliance to be considered "green" it should draw less than 250 watts.An appliance manufacturer claims to have developed a new "green" toaster oven that consumes an average of no more than 250 W. From previous studies, it is believed that power consumption for toaster ovens is normally distributed with a standard deviation of 18 W. A consumer group suspects the actual average is more than 250 W. They take a sample of 20 toaster ovens and calculate the average consumption to be 260 W.Design and run a test with =.06to see if the consumer groups suspicions are justified.

Calculate the probability of a type two error, for the test above, If the actual mean power usage of the new oven is 251 watts.